(19)

(11)

EP 0 575 503 A1

(12)

(43) Date of publication: 29.12.1993 Bulletin 1993/52 (21) Application number: 92908372.0 (22) Date of filing: 05.03.1992

(51) International Patent Classification (IPC):  A01N 47/ 36( . ) C07D 213/ 80( . ) C07D 521/ 00( . ) A01P 13/ 00( . ) C07D 401/ 12( . ) (86) International application number: PCT/US1992/001528 (87) International publication number: WO 1992/015576 (17.09.1992 Gazette 1992/24)

(84) Designated Contracting States: AT BE DE DK ES FR GB IT (30) Priority: 07.03.1991 US 19910666109 (71) Applicant: E.I. DU PONT DE NEMOURS AND COMPANY Wilmington Delaware 19898 (US)	(72) Inventors: ANDREA, Tariq, Arthur Hockessin, DE 19707 (US) LIANG, Paul, Hsiao-Tseng Wilmington, DE 19808 (US) (74) Representative: Hildyard, Edward Martin, et al  Frank B. Dehn & Co. European Patent Attorneys Imperial House 15-19 Kingsway London WC2B 6UZ London WC2B 6UZ (GB)